Prosthetic device for heart valve reinforcement and remodeling procedures

ABSTRACT

A prosthetic heart valve reinforcement ring is disclosed, which includes a ring body sized and dimensioned to fit an annulus of a heart valve. The ring body has an inner surface. A plurality of suture engaging features is on the inner surface of the ring body. A method of reinforcing a heart valve is also disclosed. Sutures are provided around an annulus of a heart valve. The proper size of the heart valve is determined by inserting a prosthetic ring around the annulus of the heart valve. The fit of the prosthetic ring is tested by attaching the sutures to the suture engaging features of the prosthetic ring. The fit of the prosthetic ring is adjusted by manipulating the sutures about the suture engaging features. The sutures are tied, securing the prosthetic ring in place.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent document claims priority to earlier filed U.S. ProvisionalPatent Application Ser. No. 61/639,482, filed Apr. 27, 2012, and U.S.Provisional Patent Application Ser. No. 61/641,338, filed May 2, 2012,the entire contents of which are incorporated herein by reference.

BACKGROUND

1. Technical Field

The present patent document relates generally to heart valve ring andaortic root remodeling procedures, and more specifically to a prostheticdevice for reinforcement of heart valves (mitral, tricuspid, aortic,pulmonic) and also for aortic root remodeling. With reference to theaortic root, the concept of sizing applies to not only the annulus, butalso to the aortic root structure itself, both in terms of “ring”sizing, as well as, “graft” sizing (e.g. in Tirone David typeprocedures).

2. Background of the Related Art

Heart valve reinforcement rings (also, aortic root remodeling grafts)are difficult to size properly and, once sized properly, requireadditional labor to secure into position to the heart structure beingreinforced or remodeled, as the case may be. This process can becometechnically even more difficult (more labor intensive) during minimallyinvasive procedures where the surgeon must implant the ring through asmall incision under circumstances where even easy steps potentiallybecome more difficult.

Therefore, there is a perceived need in the industry for heart valveannular rings (aortic root grafts) that are easier for a surgeon tosecure into position especially in terms of proper sizing, ease ofimplantation, and minimization of surgical steps/operating time. Theseconcepts may become even more relevant to patients undergoing minimallyinvasive procedures.

SUMMARY

The present invention solves the problems of the prior art by providinga heart valve ring (aortic root graft/composite ring with graft) thatcan be implanted with greater ease and accuracy. The ring includes aninner ring and an outer ring that snap together. Sutures are capturedbetween the rings to allow the surgeon to test the fit of the ring. Oncesure of the fit, the ring may be (permanently) secured into position inone of several ways. (Also the valve/root structures can be measuredusing disposable/reusable sizers, then swaped-out for the finalprosthetic device to be permanently implanted). The ring may furtherinclude a composite graft, or simple graft, extending from the outerring for aortic root remodeling procedures. Furthermore, the ring may beused with self-cinching or self-securing sutures.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the presentinvention will become better understood with reference to the followingdescription, appended claims, and accompanying drawings where:

FIG. 1A shows a step of an outer portion of a sizing ring corralling thesutures around heart valve;

FIG. 1B shows a step of an inner portion of a sizing ring being insertedinto the outer ring, trapping the sutures therebetween;

FIG. 1C shows a step of a prosthetic ring being substituted for theouter ring, with sutures being progressively tied to the prostheticring;

FIG. 1D shows a step of removing the inner sizing ring from the outerprosthetic ring;

FIG. 2A shows a partial top view of a first embodiment of a sutureengaging features of the prosthetic ring;

FIG. 2B shows a partial top view of a second embodiment of a sutureengaging features of the prosthetic ring;

FIG. 2C is a cross-section view through line 2C-2C of FIG. 2A;

FIG. 2D is a cross-section view through line 2D-2D of FIG. 2B

FIG. 3 shows a method of tying both the prosthetic and inner sizing ringto the surgical site;

FIG. 4 shows a partial view of a third embodiment of suture engagingfeatures on both the prosthetic ring and the inner sizing ring;

FIG. 5 shows a method of tying both the prosthetic and inner sizing ringto the sutures using a suture with a pre-tied clasp;

FIG. 6A shows a partial view another embodiment of the prosthetic havingan outer ring and an inner ring, where only the inner ring includessuture engaging features;

FIG. 6B shows a partial view of the inner ring shown in FIG. 6A inisolation;

FIG. 7 shows a partial view of another embodiment where the prostheticincludes grooves coated with a soft suture-gripping material;

FIG. 8 shows a partial view of another embodiment of a prosthetic ringthat includes a mesh sheath that the surgeon may sew directly to thesurgical site;

FIG. 9A shows an exploded partial view of an embodiment of a prostheticring with graft material extending therefrom;

FIG. 9B is a partial view of an embodiment of the prosthetic with graftmaterial that locks inside an outer ring;

FIG. 9C is a partial view showing the outer ring being removed from theprosthetic ring with graft material;

FIG. 9D is a partial view showing the prosthetic ring being tied inplace at the surgical site;

FIG. 10A is a partial exploded view of an embodiment of the prostheticring with graft material that snaps around or over an inner ring;

FIG. 10B is a bottom view of the embodiment shown in FIG. 10A, showingthe outer ring locking around the inner ring;

FIG. 11 is an exploded view of an embodiment of a prosthetic ring foraortic root remodeling procedures showing the peaks and valleys in theprosthetic ring;

FIG. 12 is a perspective view of an embodiment of the prosthetic ringfor aortic root remodeling procedures showing the sutures grasped in theprosthetic ring;

FIG. 13 is an elevation view of an embodiment of the prosthetic ring foraortic root remodeling procedures showing graft material extending fromthe prosthetic ring;

FIG. 14 is a view of a single ring system, prosthetic heart valve ring,showing a plurality of groove with suture gripping material; and

FIG. 15 is an enlarged view of inset 15 of FIG. 14.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Provisional Patent Application Ser. Nos. 61/551,728, filed on Oct. 26,2011, and 61/555,002, filed on Nov. 3, 2011, are incorporated herein byreference in their entirety.

The “sizing” component of the operation can be performed using a fullset of separate sizers which can be reusable or disposable, such as iscommonly the practice today for ring/valve surgery. Once the proper sizehas been determined (using the previously described sizing system), theactual prosthetic device can then be substituted and used forimplantation. This type of system may have the added benefit of allowingfor the final prosthesis to be constructed as a solid ring (no gap at 12o'clock as seen in some figures of the sketches). Alternatively, theprosthesis itself can be used for both sizing and final implantation.

Though, the initial portion of the procedure involves two rings, thefinal prosthetic implant can either be the described combination of tworings, or alternatively, a single remaining ring, after one of the tworings is removed. This will depend on the method by which the prosthesisis secured into position.

The preferred embodiment results in the final implantation of only oneof the two, paired rings. With this embodiment, the two ring system canbe utilized such that the inner (inner or outer for aortic root) ring isa temporary guide used to help align and position sutures but is thenremoved after the sutures have been tied down onto the outer permanentring (see, e.g., FIGS. 1D, 10C). Additional benefits to the one ringmethod include less prosthetic material. Also potential for infectiouscomplications can be minimized because less or better material can beused (such as a plain metal ring instead of one covered with mesh toaccept sutures).

Referring to FIGS. 1A-1D of the sketches demonstrates a quick summary ofthe process. 1A) Outer ring 10 of the sizing device is placed outside ofthe annular sutures 12. 1B) The inner ring 14 of the sizing device iscombined with the outer ring 10, and the annular sutures 14 are capturedin between. This combination can be repeated several times until thebest size and shape have been selected. 1C) The outer sizing ring 10 isremoved and replaced with the actual prosthetic device 16. The innerring 14 can remain in place to help with retaining suture position andtying. Sutures 12 are tied down directly onto the prosthetic ring at 18.1D) The inner ring 14 is removed, leaving the prosthetic ring 16 inplace.

As will be more fully explained below, the sutures 12 can be tiedwithout the use of additional needle passes by simply tying the “ringstogether.” This is accomplished by “hooking” or “wrapping” the sutures12 on elements of the prosthetic ring 16 such as barbs, posts, or someother form of either a groove or projection, etc., described in moredetail below.

FIG. 2A shows spaced apart grooves 20 on the outer ring 16 of theprosthetic. In a cross-section view, FIG. 2C, the space between thegrooves 20 includes a hook 22 formed within the body of the outerprosthetic ring 16. That is, a small recess 24 within the body of theouter ring 16 of the prosthetic is formed, creating a hooked end 26. Thesutures 12 are tied off on the hook 22, preventing the outer ring 16from moving on the annulus.

FIG. 2B shows an embodiment of the outer ring 116 where the outer ring116 includes closely spaced grooves 120. The surfaces of the grooves mayinclude a rubber coating to grip sutures. In a cross-section view, FIG.2D, the space between the grooves 120 includes a hook 122 formed from aprojection from the body of the outer ring 116. The sutures 12 are tiedoff on the hook 120, preventing the outer ring 116 from moving on theannulus.

One of various knot-tying devices can be used to tie, crimp, etc. thesutures 12 as is often done with minimally invasive surgical techniques.

Referring to FIG. 3, in a two-ring system, the prosthetic ring 200includes an inner ring 214 with a gap 228, or defect, allowing sutures12 to be gathered within the inner ring 214. The gap 228 also permitsthe inner ring 214 to flex inwardly. The inner ring 214 snap-fits intoan outer ring 216. Together, the inner ring 214 and outer ring 216 mayform a complete prosthesis. The inner ring 214 and outer ring 216 mayinclude complimentary mating formations to permit a tight and secure fittogether, yet permit the sutures 12 to be captured between the innerring 214 and the outer ring 216. More specifically, the inner ring 214may include a concave surface that complimentarily mates with a convexsurface on the outer ring 216. The entire prosthesis 200 may then betied down in place as is known in the art.

Because the embodiment includes an inner ring 214 and an outer ring 216that can snap-fit around the sutures 12, the surgeon can determine anoptimal fit for the prosthetic ring 200 prior to tying the prostheticring 200 in place around the annulus of the heart valve. The prostheticring 200 thus doubles as a sizer for determining the appropriate ringsize for reinforcing the heart valve and then as the permanentprosthetic. The surgeon need not remove the prosthetic ring 200 once hehas determined the fit is adequate. This prosthetic ring 200 may be usedfor any heart valve including aortic root remodeling procedures as well.

The inner ring 214 and the outer ring 216 may also include notches orstays 218 formed on the surface facing away from the mating surfaces ofeither ring (See, e.g. FIG. 4). These notches or stays 218 areconfigured to receive the suture 12 therein or tied thereto,respectively, and prevent the prosthetic ring 200 from shifting.Alternatively, a suture 12 with a self-tying knot and clasp 220 may beused to secure the assembled prosthetic ring 200 to the annulus 222 ofthe heart valve. (See, e.g., FIG. 5). Also, a suture tying hand tool maybe used such as known in the art.

Referring to FIGS. 6A and 6B, in another embodiment 300 of a two-ringsystem, the grooves 320 may be formed on the inner ring 314 instead ofthe outer ring 316. The inner ring 314 may also have a complimentaryprofile to the outer ring 316 thereby minimizing the overall size of thetwo rings 314, 316 when interlocked. More specifically, the inner ring314 includes a concave outer surface 330 that complimentarily mates witha convex inner surface 332 of the outer ring 316. The grooves 320 formedon the inner ring 314 form tooth-like projections that the sutures 12are tied down against. Additional sutures 12 may be wrapped around bothrings 314, 316, securing the entire embodiment 300 to the annulus of theheart valve. The inner ring 314 may also include hooks and tie-downstructures for the sutures 12 as described in FIGS. 2A, 2B and 4, andaccompanying text.

Referring to FIG. 7, in another embodiment 400, the grooves 420 on theouter prosthetic ring 416 may include a gripping material 422, such as arubber coating, formed inside the grooves 420. The gripping material 422allows the sutures 12 to be pulled into and out of the grooves 420without fear of damage and to enable positioning and testing of theprosthetic ring 416. Once the fit is determined to be optimal, thesutures 12 may be tied down against the outer ring 416 as describedpreviously. As may be appreciated by one skilled in the art, grippingmaterial 422 may also be added to grooves 420 formed on an inner ring320, as shown in FIGS. 6A and 6B, if used.

Referring to FIG. 8, in another embodiment 500, the prosthetic ring 516may also be sheathed in a mesh material 534, enabling a surgeon to sewthe prosthetic ring 516 directly to the annulus. The mesh material 534provides an additional method of anchoring the prosthetic ring 516 tothe annulus where grooves and other tie-down structures described above,prove to be inadequate to create the fit the surgeon desires. By sewingthrough the mesh material 534, the surgeon may further secure theprosthetic ring 516to achieve the most optimal fit.

Referring to FIGS. 9A-9D, 10A, 10B, and 11-13, similar concepts can beapplied to remodeling of the aortic root of the heart. Variousapplications include, but are not limited to, annular reinforcementusing a ring system, using a graft system, or a composite ring/graftsystem. Which can also be secured in a variety of ways as previouslydescribed, but in addition, a technique can be utilized where a ring issecured to the annulus and then the remaining composite ring/graft issnapped onto the first ring, etc.

Referring first to FIGS. 9A-9D, an embodiment 600 of a prosthetic ring602 with graft material 604 extending therefrom is configured tointerlock with a second outer ring 606. A second outer ring 606 may beused to facilitate sizing and tying of sutures 12 on the compositeaortic root graft 600. The second outer ring 606 may then be removedonce the composite aortic root graft 600 is implanted. The sutures 12are captured between the outer ring 604 and prosthetic ring 602,enabling the surgeon to test for a proper fit. Once the fit isdetermined to be optimal, the composite aortic root graft 600 is tied inplace.

The prosthetic ring 602 includes a number of suture engaging features608, such as grooves, to permit the composite aortic root graft 600 tobe secured in place. The grooves 608 may be formed on the bottom andouter surface of the prosthetic ring 602. Other suture engaging featuresdescribed above in the other embodiments may also be used.

Referring to FIGS. 10A and 10B, in another embodiment 700 with graftmaterial 704 extending from the prosthetic ring 702, the prosthetic ring702 locks around a second inner ring 706. In effect, this embodiment 700is the reverse of the embodiment 600 shown in FIGS. 9A-9D.

Referring to FIGS. 11-13, another embodiment of a prosthetic ring 800for aortic root remodeling procedures is shown. The inner and outerrings 802, 804 of the prosthetic ring 800 of this embodiment includespeaks 806 and valleys 808 formed in the prosthetic ring 800 adapted tobe fit around and suspend the aortic heart valve for aortic rootremodeling procedures. Each peak 806 provides a point where the tabformed at the corner of the leaflets of the aortic valve may besupported and secured thereto. Grooves 810 may be provided to securesutures 12 thereto, enabling temporary testing of the fit prior tosewing the sutures 12 in place. The inner and outer rings 802, 804snap-fit together and may be secured in a like manner as described abovefor the other embodiments. The defect 814 (best seen in FIG. 11) toround up the sutures 12 and provide flexibility to the prosthetic ring800 may be in the outer ring 802 instead of the inner ring 804.

The rigidity of the prosthetic ring 802 prevents under-sizing as well asoversizing of the valve while tying sutures 12 down.

Referring to FIG. 13, graft material 812 may extend from the outer ring802. Like the embodiment 700 shown in FIGS. 10A and 10B, the rings 802,804 may be reversed, where the graft material 812 extends from the innerring 804 instead. The graft material 812 may be secured in place to theaortic walls to further stabilize the aorta as is known in the art.

In addition, a stand-alone prosthetic ring 800 may be secured around theaortic valve and graft material attached to the aorta and heart tissuesseparately.

Referring to FIGS. 14 and 15, alternatively, the sizer and prosthesis900 can function each as an independent one-ring system. On the innersurface 902 of the ring 900 are a number of grooves 904 to secure thesutures. The grooves 904 themselves provide a firm but gentle graspingupon the sutures (rubber coating, etc.) much like the function performedby a valve or suture organizer. As such, the sutures can easily be movedfrom groove 904 to groove 904 until optimal spacing is achieved. Suturescan then be tied down in this optimal position. Sizers can be swappedout as needed before selecting the final ring prosthesis 900. In thecase of flexible or partial rings they can be attached to a rigidtemporary support structure which can be cut out/away once theprosthesis 900 has been tied down. The sizer/prosthesis 900 itself canalso function as the suture or valve organizer.

It would be appreciated by those skilled in the art that various changesand modifications can be made to the illustrated embodiments withoutdeparting from the spirit of the present invention. All suchmodifications and changes are intended to be within the scope of thepresent invention, except insofar as limited by the appended claims.

What is claimed is:
 1. A prosthetic heart valve reinforcement ring,comprising a ring body sized and dimensioned to fit an annulus of aheart valve, the ring body having an outer surface and an opposing innersurface, a plurality of suture engaging features on the inner surface ofthe ring body; the suture engaging features comprising a plurality ofgrooves formed on the inner surface of the ring body; a plurality ofsuture tie-down hooks interleaved between the grooves wherein each hookis adjacent to two grooves; each hook having a hooked end projectingoutwardly towards the outer surface and radially away from the innersurface of the ring body; an inner ring releasably attachable to aninner surface of the ring body, the inner ring configured and arrangedto temporarily trap annular sutures between the ring body and the innerring.
 2. The prosthetic heart valve reinforcement ring of claim 1,wherein the grooves have a rubber coating.
 3. The prosthetic heart valvereinforcement ring of claim 1, wherein the hooked end is formed by arecess within the ring body.
 4. The prosthetic heart valve reinforcementring of claim 1, wherein the hooked end is formed by a projection fromthe ring body.
 5. A method of reinforcing a heart valve, comprising:providing sutures around an annulus of a heart valve; inserting aprosthetic ring having a plurality of suture engaging features aroundthe annulus of the heart valve, the prosthetic ring comprising a ringbody having an outer surface and an opposing inner surface, a pluralityof suture engaging features on the inner surface of the ring body, thesuture engaging features comprising a plurality of grooves formed on theinner surface of the ring body; a plurality of suture tie-down hooksinterleaved between the grooves wherein each hook is adjacent to twogrooves, each hook having a hooked end projecting outwardly towards theouter surface and radially away from the inner surface of the ring body;attaching the prosthetic ring to an inner ring, wherein the inner ringreleasably engages an inner surface of the ring body, the inner ringconfigured and arranged to temporarily trap the sutures between the ringbody and the inner ring.
 6. The method of claim 5, further comprisingusing a knot-tying device to tie the sutures.
 7. The method of claim 5,further comprising wrapping sutures on the prosthetic ring.
 8. Themethod of claim 5, further comprising tying the sutures to the annulusof the heart valve.
 9. The method of claim 5, further comprisingremoving the inner ring.
 10. The method of claim 5, further comprisingtying the sutures to the hooks of the suture engaging features.
 11. Aprosthetic heart valve reinforcement ring, comprising a ring body sizedand dimensioned to fit an annulus of a heart valve, the ring body havingan outer surface and an opposing inner surface, a plurality of sutureengaging features on the inner surface of the ring body; the sutureengaging features comprising a plurality of grooves formed on the innersurface of the ring body; a plurality of suture tie-down hooksinterleaved between the grooves wherein each hook is adjacent to twogrooves; each hook having a hooked end projecting outwardly towards theouter surface and radially away from the inner surface of the ring body;the hooked end of each hook further being distinct from the adjacent twogrooves; an inner ring releasably attachable to an inner surface of thering body, the inner ring configured and arranged to temporarily trapannular sutures between the ring body and the inner ring.